公开(公告)号：EP1462848A2

公开(公告)日：2004-09-29

申请号：EP04006226.7

申请日：2004-03-16

Applicant: FUJITSU LIMITED

Inventor： Akiyama, Yuichi ,  Ooi, Hiroki

IPC: G02F1/225 ,  G02F1/03

CPC classification number: H04B10/50597 ,  G02F1/0121 ,  G02F1/0123 ,  G02F1/225 ,  G02F2201/16 ,  H04B10/5051 ,  H04B10/50575 ,  H04B10/50577 ,  H04B10/5162 ,  H04B10/58

Abstract: An object of the invention is to provide a control system in which the phase shift between drive signals of an optical modulator can be reliably detected and compensated by a simple configuration. To this end, a control apparatus of the invention, for an optical modulator generating a signal light of a CS-RZ modulation system or the like by two LN modulators (10,20) connected in series, detects the phase shift between drive signals given to the former and latter stage LN modulators, or judges the phase shift between the drive signals based on intensity information of the electric spectrum of the signal light output from the optical modulator, to control the phases of the drive signals so as to minimize the phase shift. As a result, the phase shift between the drive signals can be reliably detected and compensated by an electric circuit with a simple configuration.

Abstract translation: 本发明的目的是提供一种控制系统，其中可以通过简单的配置可靠地检测和补偿光调制器的驱动信号之间的相移。 为此，本发明的控制装置，用于通过串联连接的两个LN调制器（10,20）产生CS-RZ调制系统等的信号光的光学调制器，检测给定的驱动信号之间的相移 到前一级和后级LN调制器，或者基于从光调制器输出的信号光的电谱的强度信息来判断驱动信号之间的相移，以控制驱动信号的相位，以使相位最小化 转移。 结果，可以通过具有简单结构的电路可靠地检测和补偿驱动信号之间的相移。

公开(公告)号：EP1166064A1

公开(公告)日：2002-01-02

申请号：EP00919988.6

申请日：2000-03-31

Applicant: HINDS INSTRUMENTS, INC.

Inventor： KADLEC, Paul

IPC: G01J4/00

CPC classification number: G02F1/0131 ,  G02F1/0121

Abstract: A diagnostic system (24) for a PEM (20) provides optically determined information about the retardance characteristics induced by the PEM (20). The diagnostic system (24) is integrated with the PEM (20) so that the PEM (20) performance may be diagnosed or monitored during operation of the PEM (20). Specifically, the diagnostic system (24) is used alongside an optical setup (22) that employs a primary light beam (28) for conventional purposes such as polarimetry, optical metrology, etc. The diagnostic system (24) includes its own diagnostic light source (50) that is directed through the optical element (32) of the PEM (20) at a location remote from the primary aperture (38) of the PEM (20). Thus, the diagnostic system (24) and the primary PEM (20) operation can be undertaken simultaneously, with one not interfering with the other. The output of the diagnostic system reflects the actual retardance characteristic provided by the PEM (20) and can be used as feedback to adjust the PEM control as needed.

公开(公告)号：EP0975104A1

公开(公告)日：2000-01-26

申请号：EP98305813.2

申请日：1998-07-21

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Dorschky, Claus ,  Teichmann, Bernd ,  Haunstein, Herbert

IPC: H04B10/155 ,  G02F1/00

CPC classification number: H04B10/508 ,  G02F1/0121 ,  H04B10/5051 ,  H04B10/50575 ,  H04B10/5162

Abstract: The present invention generally relates to the field of signal generation and particularly to a method and an apparatus for generating a modulated RTZ signal from a RTZ signal by driving an modulator with a non-RTZ signal.
For the transmission of optical high bit-rate signals over a fibre mainly intensity modulated optical signals are used. To intensity modulate an optical signal with data formed by a bit sequence the optical power of an optical carrier is switched on and off according to the bit sequence. There are non-RTZ signals having a constant high power level for consecutive bits of the bit sequence having a high level, and RTZ signals for which the power level is set back to zero within each bit interval. To correctly modulate the RTZ signal with the electrical non-RTZ signal a fixed phase relation between the two signals is necessary.
The invention under consideration provides a method and an apparatus for automatically aligning the phases of the RTZ signal and the non-RTZ signal by phase modulation of one of the signals with an auxiliary signal and analysing the modulated RTZ signal generated from the signals. The analysis and the phase alignment are based on deviations in the mean signal power of the modulated RTZ signal.

Abstract translation: 本发明一般涉及信号产生领域，特别涉及通过驱动具有非RTZ信号的调制器从RTZ信号产生调制的RTZ信号的方法和装置。 对于通过光纤传输光学高比特率信号，主要使用强度调制的光信号。 为了用由比特序列形成的数据对光信号进行强度调制，光载波的光功率根据比特序列被打开和关闭。 存在对具有高电平的比特序列的连续比特具有恒定高功率电平的非RTZ信号，以及在每个比特间隔内功率电平被设置为零的RTZ信号。 为了使用电气非RTZ信号正确调制RTZ信号，需要两个信号之间的固定相位关系。 所考虑的发明提供了一种用于通过辅助信号的一个信号的相位调制来自动对齐RTZ信号和非RTZ信号的相位并分析从信号产生的调制的RTZ信号的方法和装置。 分析和相位对准基于调制的RTZ信号的平均信号功率的偏差。

公开(公告)号：EP0263612B1

公开(公告)日：1997-11-05

申请号：EP87308307.5

申请日：1987-09-18

Applicant: BRITISH TELECOMMUNICATIONS public limited company

Inventor： Walker, Nigel Gordon

IPC: G02F1/01

CPC classification number: G02F1/0136 ,  G02F1/0121 ,  G02F1/035 ,  G02F2001/0142 ,  G02F2203/07 ,  Y10S359/90

公开(公告)号：EP0167143B2

公开(公告)日：1996-12-04

申请号：EP85108162.0

申请日：1985-07-02

Applicant: HITACHI, LTD.

Inventor： Umeda, Takao ,  Ohishi, Kazuya ,  Igawa, Tatsuo ,  Hori, Yasuro

IPC: G02F1/01 ,  G02F1/133 ,  B41J2/435 ,  G09G3/36

CPC classification number: G06K15/1252 ,  G02F1/0121 ,  G02F1/13306 ,  Y10S359/90

公开(公告)号：EP0681199A3

公开(公告)日：1996-02-07

申请号：EP95302830.5

申请日：1995-04-26

Applicant: AT&T Corp.

Inventor： Miller, David A.B. ,  Woodward, Ted K.

IPC: G02F1/01 ,  G02F1/03

CPC classification number: B82Y20/00 ,  G02F1/0121 ,  G02F1/017 ,  G02F1/0327 ,  G02F2201/126 ,  H03K17/6871

Abstract: A drive circuit for increasing the voltage range applied across an optical modulator (M₁) in a transmitter stage of an optical communication system comprises a first switch (Q₁,Q₂) and a second switch (Q₃,Q₄) connected thereto. The first switch is responsive to a first input signal (A) and has a maximum voltage drop equal to a first reference voltage (+Vmod). The second switch is responsive to a second input signal ( A ¯ -Vmod) and has a maximum voltage drop equal to a second reference voltage (-Vmod). A modulator (M₁) is connected between the first and second switches so that, depending on the values of the first and second input signals, the maximum voltage drop across the modulator will be a value (2Vmod) greater than either the first or the second reference voltage.

Abstract translation: 用于增加在光通信系统的发射机级中跨越光调制器（M1）施加的电压范围的驱动电路包括与其连接的第一开关（Q1，Q2）和第二开关（Q3，Q4）。 第一开关响应于第一输入信号（A）并且具有等于第一参考电压（+ Vmod）的最大电压降。 第二开关响应于第二输入信号（A-Vmod）并且具有等于第二参考电压（-Vmod）的最大电压降。 调制器（M1）连接在第一和第二开关之间，使得根据第一和第二输入信号的值，调制器两端的最大压降将是大于第一或第二开关的值（2Vmod） 参考电压。

公开(公告)号：EP0681199A2

公开(公告)日：1995-11-08

申请号：EP95302830.5

申请日：1995-04-26

Applicant: AT&T Corp.

Inventor： Miller, David A.B. ,  Woodward, Ted K.

IPC: G02F1/01 ,  G02F1/03

CPC classification number: B82Y20/00 ,  G02F1/0121 ,  G02F1/017 ,  G02F1/0327 ,  G02F2201/126 ,  H03K17/6871

Abstract: A drive circuit for increasing the voltage range applied across an optical modulator (M₁) in a transmitter stage of an optical communication system comprises a first switch (Q₁,Q₂) and a second switch (Q₃,Q₄) connected thereto. The first switch is responsive to a first input signal (A) and has a maximum voltage drop equal to a first reference voltage (+Vmod). The second switch is responsive to a second input signal ( A ¯ -Vmod) and has a maximum voltage drop equal to a second reference voltage (-Vmod). A modulator (M₁) is connected between the first and second switches so that, depending on the values of the first and second input signals, the maximum voltage drop across the modulator will be a value (2Vmod) greater than either the first or the second reference voltage.

公开(公告)号：EP0540331A2

公开(公告)日：1993-05-05

申请号：EP92309917.0

申请日：1992-10-29

Applicant: FUJITSU LIMITED

Inventor： Onishi, Masaru, c/o FUJITSU LIMITED ,  Suzuki, Kazuhiro, c/o FUJITSU LIMITED

IPC: G02F1/015 ,  G02F1/17

CPC classification number: G02F1/015 ,  G02F1/0121 ,  G02F2001/0155 ,  G02F2001/0157 ,  G02F2203/19

Abstract: An electric field absorption light modulation unit (3) includes a light emission device (1) for emitting light and a modulation device (2) for varying a light transmittance thereof of light applied by the light emission device (1) so as to provide the light as a result of modifying thereof. A driving signal generating unit (10 and 11) coupled with the electric field absorption light modulation unit (1) generates a driving signal to be applied to the modulation device (2) from an input information signal by making the modulation device (2) vary the light transmittance thereof, and the driving signal generating unit (10 and 11) provides the driving signal so that the driving signal in a fluctuation range in which an undesirable level fluctuation may be present, corresponds to a constant working range of the modulation device (2), the light transmittance thereof staying at a constant value in the constant working range.

Abstract translation: 电场吸收光调制单元（3）包括用于发光的发光装置（1）和用于改变由发光装置（1）施加的光的透光率的调制装置（2），以便提供 作为其修改的结果的光。 与电场吸收光调制单元（1）耦合的驱动信号产生单元（10和11）通过使调制装置（2）变化而从输入信息信号产生施加到调制装置（2）的驱动信号 其透光率和驱动信号产生单元（10和11）提供驱动信号，使得可能存在不期望的电平波动的波动范围内的驱动信号对应于调制装置的恒定工作范围（ 2），其透光率在恒定工作范围内保持恒定值。

公开(公告)号：EP0222797A4

公开(公告)日：1988-04-27

申请号：EP86902777

申请日：1986-04-30

Applicant: UNIV AUSTRALIAN

Inventor： LING WILLIAM PUI

IPC: G02F1/01 ,  G02F1/11

CPC classification number: G02F1/0131 ,  G02F1/0121 ,  G02F1/113

Abstract: An optical plate for a photoelastic modulator comprises an elongate rod or bar (32) of an optically transparent medium, on one face of which a first piezo-electric transducer (34) is mounted to apply an alternating longitudinal stress to the bar. A second piezo-electric transducer (35) is mounted to detect transverse oscillations of the bar. A signal from the second piezo-electric transducer is used in a positive feedback loop to control the frequency of the signal which drives the first piezo-electric transducer. The two transducers are mounted a distance of about one quarter the length of the rod or bar (32) from one end thereof. The two transducers are preferably combined in a single piezo-electric transducer with an electrode (40) to detect transverse oscillations being positioned within an aperture in the driving electrode (38) of the first transducer. For wavelength tracking of the photoelastic modulator, a sensor (52) monitors the movement of one end of the rod or bar (32). The signal (50) from this sensor (52) is compared with a reference signal (51) that is indicative of the wavelength of the light beam (14) passing through the bar (32), to produce an error signal which controls the amplitude of the signal generated by the driver (42) of the first piezo-electric transducer (34).

公开(公告)号：EP3308217A1

公开(公告)日：2018-04-18

申请号：EP16806450.9

申请日：2016-06-10

Applicant: The University of Sydney

Inventor： MARPAUNG, David Albert Immanuel ,  PAGANI, Mattia ,  SHAHNIA, Shayan

IPC: G02F1/01 ,  H04B10/80

CPC classification number: H04B10/2575 ,  G02F1/01 ,  G02F1/0121 ,  G02F1/0147 ,  G02F1/225 ,  G02F2203/15 ,  G02F2203/48 ,  H04B10/5165 ,  H04B10/90 ,  H04B2210/006

Abstract: A microwave photonic notch filter comprising: a modulator to modulate an optical signal with an electrical signal to generate a first sideband and a second sideband; a configurable optical processor to generate a modified optical signal by adjusting the power of the sidebands to achieve a power difference between first sideband and second sideband and by producing an antiphase relationship between light within two sidebands corresponding to the selected frequency band; an optical resonance to adjust the power of the first sideband of the modified optical signal corresponding to the selected frequency band by a resonance power adjustment to generate a resonance output signal; an optical-to-electrical converter to generate a copy of the electrical signal with suppressed frequency components within the selected frequency band; and a control unit to re-configure the configurable optical processor to adjust the power difference between two sidebands towards the resonance power adjustment.